Question

200g solutie de hidroxid de potasiu c%=28% reactioneaza cu o solutie de acid clorhidic de c%=30%.
a) cati moli de acid s-au consumat
b) cati moli de sare rezulta
c) care este masa de solutie de acid clorhidic
repede plz

Answer 1

md = msxc/100

=> md = 200x28/100 = 56 g KOH

n1 moli....56 g.......n2 moli

 HCl  +  KOH  =>  KCl  +  H2O  

 1.............56...............1

a) cati moli de acid s-au consumat

=> n1 = 1x56/56 = 1 mol HCl

b) cati moli de sare rezulta

n2 = 56x1/56 = 56 g KCl

c) care este masa de solutie de acid clorhidic

n = nr moli = masa / M.moleculara

M.moleculara HCl = 36,5 g/mol

=> m = 1 x 36,5 = 36,5 g HCl

=> md = 36,5 g HCl

ms = ?

c = 30%

=> ms = mdx100/c% = 36,5x100/30 = 121,67 g sol HCl